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Agriculture/Forestry
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Application and analysis on forest types and land-used classification using digital image processing
5. Some Specific Analytical Data Interpretation and Suggestions on Landsat-5TM Data with the “Compaq Despro 386/20” and Software Easi/Pace Version 4.2:
- data contained on the CCT. tape are digital input data,
- within 7 bands of CCT. tape, annalists may choose appropriate raw data suitable to works to be analyzed.
- available digital raw data in CCT. tape are integers of which every pixel has its spectral signature starting from 0 to 255 in each wavelength ( Band ), which is composed of 8 bits or 1 byte per pixel,
- variations ( of digital data) obtained, caused by the satellite imagery, can be adjusted by geometric correction method.
- repeatability of digital raw data information in details may be retrieved from the preservation and precision of the original data,
- massive quantity and comprehensive digital data analysis may be handled by uses of advanced statistical and mathematical techniques,
- procedures in analysis and obtaining results depend on capability of the company’s software,
- automation has been designed to analyze the intensity value up to a maximum of 255 level,
- type of standardized types classification may be applicable for the same system and regulation: the final result by computerization can be done,
- all kinds of data may be stored in the data base, such as: raw data, classified data, etc., and may be simplified to other GIS data,
- every pixel designed can be retrived and analized,
- for data to be computerized, software has important roles in providing commands, which programmers ma create to control the oerations, i.e., operational control program, compiler control program, and other programs.
6. Procedures
6.1 Hardware and Software
Hardware
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Compaq model “Despro” 386/20
- cup 80386, 32 bit capacity, speed 20 Mhz
- Match Coprocessor 80387, 32 bit, speed 30 Mhz
- Memory 2MB can be extended to 16 MB
- Card no. 9
- Cache Memory Controller 32835
- High Speed Static RAM = 32 Kb
- Image resolution : 512x512x32 bit
- Hard disk (internal)capacity : 300MB
- Monochrome Monitor – 14”
Peripherals
- EPSON LA 2500 + Dot matrix printer
- MITSUBICHI high resolution color monitor 19”
- Tape Drive, CYPHER, USA = 1600/6250 BPI
- TEAPO polygon Digital system, 24” x 36” table
- Hard disk (external) capacity 300 MB
- Tektronix color inkjet printer
Software
The package software “EAS/PACE Version 4.2”, produced by the PCI company, Canada of 25 main programs.
6.2 Methodology
6.2.1 Ground Truth Data Collection Stage
Before analysis and classification, the field data of Lamphun province were gathered by using the method of Random Sampling, limitation of the areas of spot check on, and the FCC image taken from satellite Landat – 5TM. The ground truth information in each rest site area in the field was corrected and observed, so as to be able to define the training area of several categories for supervise classification system of MAXIMUM.
LIKEHIHOOD AGORITHM. The forest land cover, other agricultural crops and artificial activities made by man collected were: water, paddy field, cropland, mixed orchard, dry dipterocarp forest, deteriorated forest land and fallow, evergreen forest, and rock pan treediperocarp forest, deteriorated forest land and fallow, evergreen forest, and rock pan tree.
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